msm: kgsl: Remove a few unused device tree properties

Remove some unneeded device tree properties. qcom,id is not
used anywhere (and is always zero).  The label name is
redundant since the platform device already has a name.

The idle-timeout is 80 ms on all targets and the snapshot
size and high bank bit are GPU target specific and can be
moved to the GPU list instead.

Change-Id: Ic0dedbadb3848b844f4742c7417cfdf9bb4ca575
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>